Answer
D.
Work Step by Step
These two phenomena occur in small populations, contradicting A., and they decrease genetic variation, counter to what B. says. C. is wrong because these occur due to population size, not due to selection.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 20 - Genes Within Populations - Review Questions - Understand - Page 419: 5
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